Yes, gambling is indeed a form of mental sport because it not only depends on physical attributes, but it also involves using one's thinking faculty to do some calculations and draw up strategies to make sure they win games and other sports that they deem fit to get involved with...
Although it becomes hazy to compare gaming to gambling as a mental sport, it is true that gaming helps us develop our mental faculties. you know sometimes video games particularly action games that improve multitasking & visual skills, also occasionally improve working memory, impulse control, attention & problem solving abilities.
https://www.nih.gov
Look at this, Children who played video games for three hours or more a day performed exceptionally well on tests of working memory & impulse control. Even board games like Scrabble & chess improve cognitive function & reduce the risk of dementia
If you talk about gambling then i have to be bias... i will say it has more to do with dopamine driven biases like chasing losses or random chance than it does with developing skills. So yeah playing video games could help you think more quickly & clearly where gambling is less about strategy and more about hurry."